I'll figure this out. Answers in comments
Answer:
C. If spiders evolved first, six legs is the derived trait.
Explanation:
A derived trait is a characteristic that is <u>present in a species but was absent in the common ancestor of this species.</u>
Spiders evolved from a crab-like ancestor and, although crabs are decapods, they possess eight walking legs and two claws. As insects evolved after spiders, the 'new' or derived trait that was absent in the ancestor would be having <u>six legs</u>.
Therefore, in this scenario, Mr. Morales states that <u>spiders evolved before insects</u>, which indicates that <u>the trait of six legs is a derived trait</u> from the last common ancestor, a characteristic that separates arachnids from insects.
If I am understanding correctly, the first thing they are asking you to do is match nitrogen bases.
Adenine (A) always pairs with thymine (T), and guanine (G) always pairs with cytosine (C).
Then, whichever are the double strands, cut them out and put them into you notebook. (I am not sure where the notebook is, but I am assuming you know)
Then in the speech bubble next to the picture of Chargaff- <u>talk about his rule. </u>
What does the rule mean?
What does the rule explain?
How is the rule demonstrated?
Lastly, finding percents. <em>What percent of the pairs has Adenine in them? </em>
For example:
If I look at this pairing below
A →T
T→ A
G →C
C→ G
50% of the pairs include Adenine.
Hope I helped! Comment if you have questions about my answer :)
Answer: Africa and South America were once joined and later broke apart.
Africa and South America were the part of a same land mass which were separated into two different land forms America and South America and drifted to different locations other than the one from where they originated. This occurred due to continental drift. The evidence of this phenomena can be observed in fossils that were found to be same in both land forms. This depicts that same type of organisms were living in both land forms. Hence, gives the evidence that land forms were related.